Tutors Answer Your Questions about Exponential-and-logarithmic-functions (FREE)
Question 766504: two variable quantities x and y are related by equation y=a(b^x),whwre a and b are constant.When the graph is plotted showing values of ln y in vertical axis and the value of x on the horizontal axis the points lie on a straight line having gradient 1.8 and crossing the vertical axis at the point (0.4.1).Find the value of a and b
Click here to see answer by josgarithmetic(39620)  |
Question 767041: 1. A rectangular piece of paper has area 100squrt2 cm^2. the piece is such that, when it is folded in half along the dashed line as shown, the new rectangle is similar (of the same shape) to the original rectangle. What are the dimensions of the piece of paper?
2. simplify: 
3. simplify, leaving answer with rational denominator
Click here to see answer by KMST(5328)  |
Question 767669: An archaeological artifact is thought to have an age of 3600 years. What C-14 radiation level should it have?
A= -8033 ln[C/15.3], where A is age in years and C is carbon-14 radiation level.
Clear ln with (10^ or e^)???
C value (2 decimals)????
can you help me understand this problem
Click here to see answer by Cromlix(4381)  |
Question 767683: please help me solve this problem
The pH of a solution is 8.1, mildly alkaline. What is the concentration of hydronium ions in the solution?
(p = -log[c], where p is pH and c is the concentration.)
c value (E notation, 1 decimal)???
Click here to see answer by solver91311(24713)  |
Question 767683: please help me solve this problem
The pH of a solution is 8.1, mildly alkaline. What is the concentration of hydronium ions in the solution?
(p = -log[c], where p is pH and c is the concentration.)
c value (E notation, 1 decimal)???
Click here to see answer by rothauserc(4718)  |
Question 767970: can you help me find the temp at 4 min??
We measured the temperature of a cooling cup of cocoa for three minutes. Here are the points we found, with time first and degrees Fahrenheit second: (0, 195.60), (1, 191.69), (2, 187.85), (3, 184.10). Create an exponential model for these data. Temperature at 4 minutes (2 decimals):???
Click here to see answer by RoRo Jaxson(21)  |
Question 767982: can you help me with this problem
China is one of the biggest potential markets for US autos. In 2010, there were 1.38E8 car owners in China and the number was growing with a doubling time of 6.3 years. How many car owners would you predict for that country in 2020? Owners (E notation, 2 decimals)??
Click here to see answer by josmiceli(19441)  |
Question 767990: i cant get my answer in E notation can someone help me please...
China is one of the biggest potential markets for US autos. In 2010, there were 1.38E8 car owners in China and the number was growing with a doubling time of 6.3 years. How many car owners would you predict for that country in 2020?Owners (E notation, 2 decimals)???
Click here to see answer by josgarithmetic(39620) |
Question 767988: can someone please help me with this problem please....
China is one of the biggest potential markets for US autos. In 2010, there were 1.38E8 car owners in China and the number was growing with a doubling time of 6.3 years. How many car owners would you predict for that country in 2020? Owners (E notation, 2 decimals)????
Click here to see answer by josgarithmetic(39620) |
Question 768043: please help
From your seat at trackside, a certain very loud racecar zooming past puts out a peak sound level of 3.6E-2 watts/square meter. What is the decibel rating of that sound?
d = 10 log w + 120..Decibels (nearest integer)????
Click here to see answer by solver91311(24713) |
Question 768201: The population of the US currently is growing with a doubling time of about 41 years. If the current population is 310 million of people, how many years will it take us to reach a population of 350 million?
Years to target value (1 decimal):
Click here to see answer by josmiceli(19441) |
Question 768188: can someone help me please????
In testing a certain machined part, it is found that the number of failures, F, increases with hours of use, h, according to the equation F=8.69*ln[h] + 20. Find the number of hours of use which leads to 75 failures.
Hours of use (nearest integer):
Click here to see answer by josgarithmetic(39620) |
Question 768178: The number of homes in our town with a broadband internet connection has been growing rapidly, as recorded in these points: (0, 3681), (1, 5888), (2, 9422), where the first coordinate is years after we begin to collect data and the second coordinate is the number of wired homes. Develop an exponential model for this scenario, with a base accurate to 2 decimals, then use your model to predict the count for year 4.
Homes with broadband in year 4 (nearest integer, no comma):
Click here to see answer by Edwin McCravy(20059)  |
Question 769231: can someone help me with this probloem its a quadratic formula
Find the solutions of 2x^2 + 5x = 17 and check graphically.
Discriminant (nearest integer)???
Smaller solution (3 decimals)???
Larger solution (3 decimals)???
Click here to see answer by stanbon(75887) |
Question 769511: can someone help me please solve this quadratic formula
You are driving along the highway when suddenly a large box falls off of a truck in front of you and dumps metal parts all over the roadway. You hit the brakes and decelerate as fast as you can. The distance D in feet that your car travels before you stop is related to your initial speed S by an equation like D = S^2 / 9. Find the initial speed S that corresponds to a stopping distance of 200 feet.
Speed in mph (positive answer only, nearest integer):
Click here to see answer by josmiceli(19441) |
Question 769449: can someone help me solve this quadratic formula word problem please
Your business finds that its revenue R is connected to the price p that you charge by the equation R = -p^2 + 100p. This equation predicts that the revenue will rise with increasing price, but eventually will drop back off as the price gets too high. You wonder what price would generate a revenue of $2500, so you plunk in that R value and rearrange the equation to 0 = p^2 - 100p + 2500. Please find p.
Price in dollars (give either answer, nearest integer)??????????
Click here to see answer by ramkikk66(644) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910
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